Stripping machine



' Jan. 12, 1937. s s, MI EN 2,067,642

STRIPPING MACHINE Filed Nov. 7, 1935 5 Sheets$heet l INVENTOR. j'rm/e 5, nyw fizz/W? ATTORNEY Jan. 12, 1937. s. s. MILLEN STRIPPING MACHINE Filed Nov. 7/ 1935 5 Sheets-$heet 2 m1 m w e w. m. m W M w 1 A 5% Jan. 12, 1937. s WLLEN I 2,067,642

STRIPPING MACHINE Filed Nov. '7, 1935 5 Sheets-Sheet 4 7'? f 7 I :1 7 u u I: I o o l o 38 INVENTOR. 574/1 /e J/ZY/eq A TTORNE Jan. 12, 1937. s, 5 MILLEN 2,067,642

' STRIPPING MACHINE Filed Nov. 7, 1935 5 Sheets-Sheet 5 um W I A 64 z fa; 70 5:" ::::f1\\\\ 1': III] 55.112: i3

[:lllllllllllllllllllllmlllllllllllm INVENTGR.

ATTORNEY Patented Jan. 12, I937 PATENT OFFICE STRIPPING MACHINE Stanley S. Millen, Glendale, Calif., assignor to Julius Schmid, Los Angeles, Calif.

Application November 7, 1935, Serial No. 48,722

10 Claims.

The present invention relates to means to strip thin rubber articles such as finger cots, toy balloons, etc., from forms on which said articles have been processed by the means shown, and

. after the manner described in my copending application for patent, entitled Bead forming machines, application No. 44,555 filed October 11, 1935.

The device of this invention forms a unit or step in a series of operations, some of which are precedent to, and others of which are subsequent to the function of the present invention.

In the manufacture of such devices as finger cots, toy balloons, etc., it is customary to dip forms or patterns 20 into a bath of liquid rubber in a vat as indicated by reference character 23, Figure l, and by one or more dippings build up an accumulation of rubber on the forms 20 until the coating on the forms is sufiiciently heavy to conform with the duty to be imposed on the article.

Form boards 2| are adapted to support forms 2!] in pendant position and are adapted to roll over the over head track 22 from stations A to BCDE and F, and after sufiicient dipping at station A, is moved via the over head track 22 to station B where the articles formed are dried. After drying, the forms are moved to station C, where the articles formed on form 26 are beaded or ringed in a machine 24 as described in my pending application for patent, entitled Bead forming machines, above referred to.

After being processed at station C, the forms are moved to station D for vulcanizing in vulcanizer 25. The forms are then moved to station E to a machine 30 for stripping, which operation forms the basis of the present invention. Subsequent to the stripping operation, the forms are cleansed at station F in a cleansing machine 2?, prior to being returned to the point of beginning for repetition of the cycle of operation just described.

The aforementioned stations, as illustrated in Figure l, are schematic only and form no part of the present invention, which is concerned only with means toremove the articles after formation and processing.

It is therefore a prime object of the present invention to provide an automatic machine which will simultaneously strip a plurality of formed articles from the forms on which said articles have been builded and processed.

Another object of the invention is to provide means to deliver the aforementioned forms to a machine wherein the articles builded on said forms may be automatically removed therefrom.

A further object of the invention is to provide means to automatically remove the aforementioned forms from the stripping machine, after the articles builded thereon have been stripped from the forms.

A still further object of the invention is to provide a machine that will remove thin rubber articles, from forms, more economically, more uniformly, and with greater rapidity than has heretofore been possible.

Referring to the drawings, of which there are live sheets:

Figure 1 is a schematic view, showing the several stations at which operations, precedent and/or subsequent to the operation with which the machine of this invention is concerned, take place.

Figure 2 is a side elevation, although partly in section, showing construction.

Figure 3 is a sectional elevation, showing construction in detail.

Figure 4 is a plan View, taken on line 44, Figure 2.

Figure 5 is a detail of one of the spreader units for the stripping brushes.

Figure 6 is a detail, taken on line 6-6, Figure 5.

Figure '7 is a sectional elevation, taken on line 1-1, Figure 3.

In the drawings, the machine of this invention is represented by the reference character 30.

A table 32 having a top 34, resting upon legs 36, forms the base for supports 38, upon which stripping units 40 are operably mounted.

As shown, particularly in Figures 2, 5, and 6, the stripping units 40, comprise a vertically movable cam rod 42, operating through bearings 44 and 46. The upper end of the cam rod 42 is provided with a fitting 48 to which laterally extending arms 50 are pivoted as shown at 52. Worm gears 54 are secured to transversally extending stripper brush shafts 56 and are revolubly connected to the ends 58 of arms 5!]. The supports 38 are provided with slots 60 through which shafts 56 may be urged in a manner to be hereinafter described.

The ends of shafts 56 are enlarged, as by a bushing 64 so as to occupy the full depth of the slots 66 to prevent shaft chatter during rotation of shafts 56, and collars 62 prevent drift and consequent misalignment of shafts 56, gears 54 and stripper brushes 56 during rotation of the shafts.

A horizontally disposed shaft 10, journalled in bearing I2, is adapted to drive worm gears I4, which are in mesh with gears 54 and which drive gears 54 to rotate brush shaft 56. A pulley I6 is mounted on shaft I0 and is operably connected with an electric motor I8 through belt 80. A base 82, is adapted to support the motor I8 and a speed reduction device 84. A shaft 86, extending from the device 84, is provided with a pulley 88, which is operably connected to a cam shaft 90' by means of a pulley 92 and a belt 94. The cam shaft is journalled in bearings 96 and is provided with a plurality of cams 98 adapted to lift cam rods 42.

As shown in Figures 3 and 4, the ends of brush shafts 56 are each provided with lateral spreading arms 50 and cam rods 42 to actuate the arms 50. For the sake of convenience, I will designate the spreading means as groupsA and B.

Group A includes means to rotate shafts 56 as well as means to spread said shafts; Whereas group B only includes means to spread shafts 56 in cooperation with group A.

In order to operate group B of the spreading means, I place sprocket wheels 93 on cam shafts and 90 over which a chain 9| is adapted to run, thereby tying the movements of cam shafts 90 and into unison and ensuring that cam rods 42 and lateral arms 50 will move synchronously to spread shafts 56.

An extensile spring I00 encircles the cam rod 42, one end of the spring rests upon plate I02 held in position by a keeper I04, while the opposite end of the spring abuts the lower end I06 of bearing 44.

The foregoing construction ensures that the cam rod 42 will return to its lower position after the lobe I08, of cam 98, passes from under the lower end of cam rod 42.

A cam H2, is mounted upon cam shaft 90 and revolves therewith, to operate lever II4, by reason of a cam-way following pin H6, which follows through the cam-way II8 as cam II2 revolves with shaft 90.

Lever II4 bracket I20 and is provided with an extension I22 to which is fitted-a throw rod I24. The rod I24 is connected to leg I26 of a bell crank I28, resting upon a base I21, the leg I30 of bell crank I28 is fitted with a throw rod I32.

Rod I32 is adjustably secured to bell crank I34, which is connected to bell crank I36 by means of an adjustable link I38. Bell crank I36 operates a fluid pressure valve I46 on power cylinder I42 by means of a control arm I44 and link I46.

An inlet pipe I48, admits fluid, preferably oil, under pressure to cylinder I42 to move piston rod I50 upwardly or downwardly in conformity with the setting of the valve I40 and its timed operation from cam II2. An exhaust pipe I52 permits the discharge of worked fluid from the cylinder I42.

The piston rod I50 is provided at its work end with a structure I54 which is adapted to hold over head rail sections I56 in spaced alignment with the over head system 22, and to move said sections I56 Vertically with respect to the medial vertical center of said power cylinder I42 and said piston I50.

Figure 3 clearly shows the manner in which form boards 2| are suspended upon rollers I58 and intermediate supporting devices I60.

By referring to Figure 4, it will be observed that stripping brushes 66 are positioned on shafts 56 at spaced intervals, and it will be noted that is oscillatably mounted upon av the intervals correspond to the spaced intervals between the forms 20 on boards 2! so that the forms 20 will be in alignment with stripping brushes 66, when the forms 20 are lowered to a proper working level. It is quite essential that brushes 56 and forms 20 be in alignment, and in order to eifect such proper alignment I provide guide-ways I62 which are secured to a structural member I64 of frame I66 by means of bolts I68.

Ihe guide-Ways I62 are formed with slots I19 within which lugs H2, formed on the outer faces of rail sections I56, are adapted to move, thereby aligning section I5I5 with the overhead system 22 and with the medial vertical center of stripping brushes 66.

A centering pin I75 is adapted to fit within an aperture formed in the structure I54 and to pass through a matched aperture in alignment with said first mentioned aperture, said second mentioned aperture being formed in form boards 2!, thereby aligning the movable boards 2i with respect to the structure I54 to prevent drift.

A hopper II! is placed under the positions occupied by the forms 20 during the'stripping operation and is adapted to receive the articles I19 as they are stripped from the forms 20, a drawer I8I is adapted to snugly fit within the hopper III to receive the articles I79 and forms a convenient means to remove the finished product from the stripping machine.

The operation of the machine is as follows:

The motor I8 is started by pressing button I92 thereby closing switch I90 to permit power to flow, from a source not shown, to the motor.

The motor I8 through pulley III, belt 80, and pulley I6 rotates shaft III and gears I4. Gears 54 in mesh with gears I4 are rotated, thereby rotating shafts 56 and stripping brushes. 66. Gears I4 and 54 are so cut that the stripping brushes rotate inwardly, or toward one another.

Simultaneously with the above operation, the cam shafts 90' and 90 are driven through motor I8, speed reducing device 84, pulleys 68 and 92, and belt 94 to rotate cams 98, thereby lifting cam rods 42. As cam rods 42 are forced vertically, through bearings 42 and 46, lateral arms 50 are forced divergently, thereby causing gears 54 to roll along the under side of gears I4, but simultaneously maintaining their operative relationship and forcing shafts 56 divergently.

Cam I I2 rotating with cam shaft 90' and operating through pin II6, lever H4 and I22, rod I24, bell crank I28, rod I32, bell crank I34, link I38, bell crank I36, link I 46, and valve controlarm I44 admits fluid under pressure to the upper end of power cylinder I42, thereby forcing piston I50 and structure I54 carrying a plurality of forms 20 downwardly. The downward movement of the forms 20 and the spreading of the brushes 66 are so timed that the forms 20 pass between the spreaded brushes 56, but at the moment the forms 20 reach their lower-most position the brushes 66 are caused to move convergingly upon the forms, for the reason that the cam lobe N18 has passed from under cam rods 42, thereby permitting springs I05-to force rods 42 downwardly carrying lateral arms 55 with it and simultaneously rolling gears 54 along the under face of gears I4, thereby rolling shafts 56 and bushings 64 through slots 60 to effect frictional contact between brushes 66 and the articles I19 on forms 26.

At the moment forms 20 reach their lowermost position, cam II2 through the aforementioned linkage, reverses valve I 40 and admits fluid under pressure to power cylinder I42 to force piston I50 and structure I54 upwardly, thereby lifting forms 20 while they are being brushed by the rotating action of stripping brushes 66.

It has been found that when the forms 20 are lifted against the brushing action of brushes 66 that the sides of the articles I19 are rolled into a compact and neat annular ring, and that after the lower end of forms 20. has passed through the brushes 66, that the rolled article I19 will drop into the hopper I11 and/or drawer I8l from which groups of articles I19 may be taken for testing and/or packaging.

The foregoing describes one cycle of operation. As soon as the piston I50 and structure I54 have lifted the overhead section I56 to a point in matched alignment with overhead section 22, pin I15 is removed, and form board 2! is rolled along the overhead 22 to station F wherein the forms 20 are cleansed, which operation, of course, forms no part of the present invention.

Upon removal of the form board 2|, a second form board 2| is rolled into section I56 and the previously described cycle of operation is again repeated.

I claim:

1. In a machine to strip thin rubber articles from forms by frictional contact, laterally movable shafts provided with friction means, means to constantly rotate said shafts, and means to move said shafts from and into frictional contact with said forms, and elevator means to move said forms and the articles on said forms, in vertical directions, against the direction of rotation of said shafts and said friction means.

2. In a machine to simultaneously strip a plurality of thin rubber articles from a group of forms by frictional contact, laterally movable shafts provided with friction means, means to constantly rotate said shafts, means to move said shafts from and into frictional contact with said forms, and means operated in timed sequence to place said forms in position for frictional contact with said friction means, and elevator means to move said forms and the articles on said forms, in vertical directions, against the direction of rotation of said shafts and said friction means.

3. In a machine to simultaneously strip a plurality of thin rubber articles from a group of forms by frictional contact, laterally movable shafts provided with friction means, means to constantly rotate said shafts, means to move said shafts from and into frictional contact with said forms, means operated in timed sequence to place said forms in position for frictional contact with said friction means, and means operated in timed sequence to withdraw said forms from frictional contact with said friction means, and elevator means to move said forms and the articles on said forms, in vertical directions, against the direction of rotation of said shafts and said friction means.

4. In a machine to strip thin rubber articles from forms, said machine comprising a plurality of pairs of shafts having brushes, supports to journal said shafts, slots in said supports, cam rods for each of said pairs of shafts, said cam rods being operable at opposite ends of said shafts, a power shaft, gears on said power shaft, a gear on one end of each of said brush shafts, said first mentioned and said second mentioned gears being in operative engagement, links joining said cam rods and the ends of said brush shafts, and cams to operate said cam rods.

5. In a machine to simultaneously strip thin rubber articles from a group of forms, a plurality of stripping units, said units including rotating brushes, means to move said forms downwardly along the medial vertical axis of the inner working faces of said brushes, means to spread said brushes for placement of said forms, means to cause said brushes to rotate in engagement with said forms and said articles, and means to withdraw said forms along said medial vertical axis from operative contact with said brushes.

6. In a machine to strip thin rubber articles from forms, a stripping unit, means to operatively support said stripping unit, vertically movable cam rods, cams to actuate said rods, laterally extending arms pivoted to said rods, transversely extending brush shafts, a plurality of brushes on said shafts, a power driven shaft, means to deliver rotational effort from said power shaft to said brush shafts, and means joining said laterally extending arms to said brush shafts to transmit motion from said cam rods to saidbrush shafts.

'7. In a machine to strip thin rubber articles from forms, a stripping unit, means to opera tively support said stripping unit, vertically movable cam rods, cams to actuate said cam rods, laterally extending arms pivoted to said rods, transversely extending brush shafts, a plurality of brushes on said shafts, a power shaft, gears on said power shaft, a gear on each of said brush shafts, said first mentioned gears being in operative engagement with said second mentioned gears, and means joining said brush shaft with said laterally extending arms to transmit motion from said cam rods to said brush shafts.

8. In a machine to strip thin rubber articles from forms, a stripping unit, means to operatively support said stripping unit, vertically movable cam rods, laterally extending arms pivoted to said rods, transversally extending brush shafts, a plurality of brushes on said shafts, a power shaft, gears on said power shaft, a gear on each of said brush shafts, said first mentioned gears being in operative engagement with said second mentioned gear to rotate said second mentioned gear, said brush shaft being joined to said laterally extending arms whereby motion from said cam rods may be transmitted to said brush shafts, said unit supporting means being provided with slots through which said brush shafts may move in response to pressure from said cam rods.

9. In a machine to strip thin rubber articles from forms, a stripping unit, means to operatively support said stripping unit, vertically movable cam rods, laterally extending arms pivoted to said rods, transversally extending brush shafts, a plurality of brushes on said shafts, a power shaft, gears on said power shaft, a gear on each of said brush shafts, said first mentioned gears being in operative engagement with said second mentioned gear to rotate said second mentioned gear, said brush shaft being joined to said laterally extending arms whereby motion from said cam rods may be transmitted to said brush shafts, said unit supporting means being provided with slots through which said brush shafts may move in response to pressure from said cam rods, and means to prevent shaft chatter during rotation of'said brush shafts.

10. In a machine to strip thin rubber articles from forms pendantly supported on movable boards, said machine comprising a table, a plurality of stripping units, means to operatively support said stripping units, said unit supporting means being provided with slots, a plurality of brush shafts extending transversally of said table and through said slots, a pair of brushes for each of said forms, a gear on one end of said brush shafts, a power shaft, gears in said power shaft, said first mentioned gear being in operative engagement with said second mentioned gears, cam rods, cams to actuate said cam rods, laterally extending arms, one end of said arms being Divoted to said cam rods, the opposite end of said 

